If you are a GIA student or alumnus, the GIA Richard T. Liddicoat Library offers digital access to many gemological texts. While they protect the full Photo Atlas behind a paywall, they offer thousands of free articles and "GemNews" archives with high-resolution inclusion photos.
An exceptional online, searchable database dedicated specifically to gemstone inclusions, offering world-class photomicrography available to the public. Photo Atlas Of Inclusions In Gemstones Pdf Free Download
Because the definitive books by Gübelin and Koivula are extensive, hardcover volumes, they are quite costly. It is natural that many students and enthusiasts look for digital versions. If you are a GIA student or alumnus, the GIA Richard T